Pencil sharpener



FIG. 1 is a front elevational view of a pencil sharpener embodying my new design;

FIG. 2 is an end elevational view thereof, the end opposite being substantially identical;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a pencil sharpener, as shown and described. 